The Classic Hike Zero Cushion Liner Crew hearkens back to their original construction but adds in recycled nylon for strength and durability while reducing environmental impact. This liner has an elasticized arch brace so your foot will enjoy a secure fit, and it will give you a flat knit toe seam for additional comfort. When you’re ready for your next hike, be sure to grab a pair of these responsibly sourced Merino wool socks to make the most of each mile on the trail. Sock Height: Crew Smartwool's first sock construction, only now featuring recycled nylon Elasticized arch brace for secure fit Flat knit toe seam for additional comfort Made in the USA of Imported Yarn Material: 59% Merino Wool 8% Nylon 30% Recycled Nylon 2% Elastane 1% Polyester